SRC4190IDB中文资料

q ATTENUATES SAMPLING AND REFERENCECLOCK JITTERq HIGH PERFORMANCE, LINEAR PHASEDIGITAL FILTERINGq FLEXIBLE AUDIO SERIAL PORTS:Master or Slave Mode OperationSupports I2S, Left Justified, Right Justified, andTDM Data FormatsSupports 16, 18, 20, or 24-Bit Audio DataTDM Mode allows daisy chaining of up to eightdevicesq SUPPORTS 24-, 20-, 18-, or 16-BIT INPUT ANDOUTPUT DATAAll output data is dithered from the internal28-Bit data pathq LOW GROUP DELAY OPTION FORINTERPOLATION FILTERq SOFT MUTE FUNCTIONq BYPASS MODEq POWER DOWN MODEq OPERATES FROM A SINGLE +3.3 VOLTPOWER SUPPLYq SMALL SSOP-28 PACKAGEq PIN COMPATIBLE WITH THE SRC4192,AD1895, AND AD1896(2)APPLICATIONSq DIGITAL MIXING CONSOLESq DIGITAL AUDIO WORKSTATIONSq AUDIO DISTRIBUTION SYSTEMSq BROADCAST STUDIO EQUIPMENTq HIGH-END A/V RECEIVERSq GENERAL DIGITAL AUDIO PROCESSING/doc/ODUCTION DATA information is current as of publication ts conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily includetesting of all ght ? 2003, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standardwarranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears atthe end of this data 023A – JUNE – REVISED JULY 2003 All trademarks are the property of their respective owners.(1) Patents Pending.(2) Refer to the Applications Information section of this data sheet for details.S R C419SRC4190SBFS023A2/doc/C4190SBFS023A3/doc/C4190PARAMETERCONDITIONMINTYP MAXUNITS DYNAMIC PERFORMANCE (1)Resolution24Bits Input Sampling Frequency f SIN 4212kHz Output Sampling Frequency f SOUT4212kHzInput: Output Sampling Ratio Upsampling 1:16Downsampling 16:1Dynamic RangeBW = 20Hz to f SOUT /2, –60dBFS Inputf IN = 1kHz, Unweighted(add 3dB to spec for A-weighted result)44.1kHz:48kHz 125dB 48kHz:44.1kHz 125dB 48kHz:96kHz 125dB 44.1kHz:192kHz 125dB 96kHz:48kHz 125dB192kHz:12kHz 125dB 192kHz:32kHz 125dB 192kHz:48kHz 125dB 32kHz:48kHz 125dB 12kHz:192kHz125

dBTotal Harmonic Distortion + Noise BW = 20Hz to f SOUT /2, 0dBFS Inputf IN = 1kHz, Unweighted44.1kHz:48kHz –125dB 48kHz:44.1kHz –125dB 48kHz:96kHz –125dB 44.1kHz:192kHz –125dB 96kHz:48kHz –125dB192kHz:12kHz –125dB 192kHz:32kHz –125dB 192kHz:48kHz –125dB 32kHz:48kHz –125dB 12kHz:192kHz–125dB Interchannel Gain Mismatch 0dB Interchannel Phase Deviation 0Degrees Mute Attenuation24-Bit Word Length, A-weighted–128dB DIGITAL INTERPOLATION FILTER CHARACTERISTICS Passband0.4535 x f SINHz Passband Ripple ±0.007dB Transition Band 0.4535 x f SIN 0.5465 x f SINHz Stop Band0.5465 x f SINHz Stop Band Attenuation–125dB Normal Group Delay (LGRP = 0)102.53125/f SIN Seconds Low Group Delay (LGRP = 1)70.53125/f SINSecondsDIGITAL DECIMATION FILTER CHARACTERISTICS Passband0.4535 x f SOUTHz Passband Ripple ±0.008dB Transition Band 0.4535 x f SOUT 0.5465 x f SOUTHz Stop Band0.5465 x f SOUTHz Stop Band Attenuation –125dB Group Delay36.46875/f SOUTSeconds DIGITAL I/O CHARACTERISTICS High-Level Input Voltage V IH 0.7 x V IOV IO V Low Level Input Voltage V IL 00.3 x V IOV High-Level Input Current I IH 0.510µA Low-Level Input Current I IL 0.510µA High-Level Output Voltage V OH I O = –4mA 0.8 x V IOV IO V Low-Level Output Voltage V OL I O = +4mA0.2 x V IOV Input CapacitanceC IN3pF

ELECTRICAL CHARACTERISTICSAll parameters specified with T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise : (1) Dynamic performance measured with an Audio Precision System Two Cascade or Cascade Plus.(2) f SMIN = min (f SIN , f SOUT ).(3) f SMAX = max (f SIN , f SOUT ).SRC4190SBFS023A4/doc/ITCHING CHARACTERISTICS Reference Clock Timing RCKI Frequency (2), (3)128 x f SMIN50MHz RCKI Periodt RCKIP 201/(128 x f SMIN )ns RCKI Pulsewidth High t RCKIH 0.4 x t RCKIP ns RCKI Pulsewidth Low t RCKIL 0.4 x t RCKIPns Reset TimingRST Pulse Width Low t RSTL 500ns Input Serial Port TimingLRCKI to BCKI Setup Time t LRIS 10ns BCKI Pulsewidth High t SIH 10ns BCKI Pulsewidth Low t SIL 10ns SDIN DataSetup Time t LDIS 10ns SDIN Data Hold Time t LDIH 10nsOutput Serial Port Timing SDOUT Data Delay Time t DOPD 10ns SDOUT Data Hold Time t DOH 2ns BCKO Pulsewidth High t SOH 10ns BCKO Pulsewidth Low t SOL 5ns TDM ModeTiming LRCKO Setup Time t LROS 10ns LRCKO Hold Time t LROH 10ns TDMI Data Setup Time t TDMS 10ns TDMI DataHold Time t TDMH10nsPOWER SUPPLIES Operating Voltage V DD 3.0+3.3 3.6V V IO1.65+3.3 3.6V Supply Current V DD = +3.3V, V IO = +3.3V I DD , Power Down RST = 0, No Clocks 100µA I DD , Dynamic f SIN = f sOUT = 192kHz 66mA I IO , Power Down RST = 0, No Clocks 100µA I IO , Dynamicf SIN = f SOUT = 192kHz 2mA Total Power Dissipation V DD = +3.3V, V IO = +3.3V P D , Power Down RST = 0, No Clocks 660µW P D , Dynamicf SIN = f SOUT = 192kHz225mWELECTRICAL CHARACTERISTICS (Cont.)

All parameters specified with T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise 4190PARAMETERCONDITIONMINTYPMAXUNITSNOTES: (1) Dynamic performance measured with an Audio Precision System Two Cascade or Cascade Plus.(2) f SMIN = min (f SIN , f SOUT ).(3) f SMAX = max (f SIN , f SOUT ).SRC4190SBFS023A5/doc/PICAL CHARACTERISTICSAt T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(12kHz:192kHz)20k40k96k80k60kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170d B F SFFT with 1kHz INPUT TONE at –60dBFS(12kHz:192kHz)20k 40k 96k80k 60kFrequency (Hz)

0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(32kHz:48kHz)5k10k24k20k15kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(32kHz:48kHz)5k10k24k20k15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(44.1kHz:48kHz)5k10k24k20k15kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(44.1kHz:48kHz)05k 10k 24k

20k 15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170SRC4190SBFS023A6/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(44.1kHz:96kHz)10k20k48k40k30kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(44.1kHz:96kHz)10k20k48k40k30kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700–20–40–60–80–100–120–140–160d B F S

FFT with 1kHz INPUT TONE at 0dBFS(44.1kHz:192kHz)20k40k96k80k60kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170d B F SFFT with 1kHz INPUT TONE at –60dBFS(44.1kHz:192kHz)020k 40k 96k80k 60kFrequency (Hz)0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(48kHz:44.1kHz)5k10k 22k20k 15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170d B F SFFT with 1kHz INPUT TONE at –60dBFS(48kHz:44.1kHz)05k 10k 22k20k 15kFrequency (Hz)SRC4190SBFS023A

7/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(48kHz:96kHz)10k20k48k40k30kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(48kHz:96kHz)10k20k48k40k30kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(48kHz:192kHz)20k40k96k80k

60kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(48kHz:192kHz)20k40k96k80k60kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(96kHz:44.1kHz)5k10k 22k20k 15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170d B F SFFT with 1kHz INPUT TONE at –60dBFS(96kHz:44.1kHz)5k 10k 22k20k 15kFrequency (Hz)SRC4190SBFS023A8/doc/

TYPICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(96kHz:48kHz)5k10k24k20k15kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(96kHz:48kHz)5k10k24k20k15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(96kHz:192kHz)20k40k96k80k60kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS

(96kHz:192kHz)20k40k96k80k60kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(192kHz:12kHz)1k2k6k5k3k 4kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(192kHz:12kHz)1k2k6k5k3k 4kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170SRC4190SBFS023A

9/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(192kHz:32kHz)2.5k5k16k15k 12.5k7.5k10kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(192kHz:12kHz)Frequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–1700 2.5k 5k 16k15k 12.5k 7.5k 10k 0–20–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(192kHz:44.1kHz)5k10k 22k20k 15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170d B F S

FFT with 1kHz INPUT TONE at –60dBFS(192kHz:44.1kHz)05k 10k 22k20k 15kFrequency (Hz)–200–40–60–80–100–120–140–160d B F SFFT with 1kHz INPUT TONE at 0dBFS(192kHz:48kHz)5k10k24k20k15kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(192kHz:48kHz)5k10k24k20k15kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170SRC4190SBFS023A10/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160

d B F SFFT with 1kHz INPUT TONE at 0dBFS(192kHz:96kHz)10k20k48k40k30kFrequency (Hz)d B F SFFT with 1kHz INPUT TONE at –60dBFS(192kHz:96kHz)10k20k48k40k30kFrequency (Hz)–60–70–80–90–100–110–120–130–140–150–160–170–200–40–60–80–100–120–140–160d B F SFFT with 20kHz INPUT TONE at 0dBFS(44.1kHz:48kHz)5k10k24k20k15kFrequency (Hz)0–20–40–60–80–100–120–140–160d B F SFFT with 20kHz INPUT TONE at 0dBFS

(48kHz:44.1kHz)05k 10k 22k20k 15kFrequency (Hz)0–20–40–60–80–100–120–140–160d B F SFFT with 20kHz INPUT TONE at 0dBFS(48kHz:96kHz)10k20k48k40k30kFrequency (Hz)–20–40–60–80–100–120–140–160d B F SFFT with 20kHz INPUT TONE at 0dBFS(96kHz:48kHz)05k 10k 24k20k 15kFrequency (Hz)SRC4190SBFS023A11/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–20–40–60–80–100–120–140–160d B F SFFT with 80kHz INPUT TONE at 0dBFS(192kHz:192kHz)20k40k

96k80k60kFrequency (Hz)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT AMPLITUDE f IN = 1kHz(44.1kHz:48kHz)–140–120–100–80–20–60–40Input Amplitude (dBFS)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT AMPLITUDE f IN = 1kHz(48kHz:44.1kHz)–140–120–100–80–20–60–40Input Amplitude (dBFS)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT AMPLITUDE f IN = 1kHz(48kHz:96kHz)–140

–120–100–80–20–60–40Input Amplitude (dBFS)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT AMPLITUDE f IN = 1kHz(96kHz:48kHz)–140–120–100–80–20–60–40Input Amplitude (dBFS)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT AMPLITUDE f IN = 1kHz(44.1kHz:192kHz)–140–120–100–80–20–60–40Input Amplitude (dBFS)SRC4190SBFS023A

12/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT AMPLITUDE f IN = 1kHz(192kHz:44.1kHz)–140–120–100–80–20–60–40Input Amplitude (dBFS)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT FREQUENCY WITH 0dBFS INPUT(44.1kHz:48kHz)5k20k10k15kInput Frequency (Hz)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT FREQUENCY WITH 0dBFS INPUT = 1kHz(48kHz:44.1kHz)5k20k10k15k

Input Frequency (Hz)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT FREQUENCY WITH 0dBFS(48kHz:96kHz)5k20k10k15kInput Frequency (Hz)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT FREQUENCY WITH 0dBFS(96kHz:48kHz)5k20k10k15kInput Frequency (Hz)–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT FREQUENCY WITH 0dBFS(44.1kHz:192kHz)5k20k10k15kInput Frequency (Hz)SRC4190SBFS023A

13/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.–100–105–110–115–120–125–130–135–140–145–150T o t a l H a r m o n i c D i s t o r t i o n +N o i s e (d B )THD+N vs INPUT FREQUENCY WITH 0dBFS(192kHz:44.1kHz)5k20k10k15kInput Frequency (Hz)0–10–20–30–40–50–60–70–80–90–100–110–120–130O u t p u t A m p l i t u d e (d B F S )LINEARITY with f IN = 200Hz(44.1kHz:48kHz)–130–120–110–100–90–80–70–60–500–40–30–20–10Input Amplitude (dBFS)0–10–20–30–40–50–60–70–80–90–100–110–120–130O u t p u t A m p l i t u d e (d B F S )LINEARITY with f IN = 200Hz(48kHz:44.1kHz)–130–120–110–100–90–80–70–60–500–40–30–20–10Input Amplitude (dBFS)0–10–20–30–40–50–60–70–80–90–100–110–120–130O u t p u t A m p l i t u d e (d B F S )LINEARITY with f IN = 200Hz

(48kHz:96kHz)–130–120–110–100–90–80–70–60–500–40–30–20–10Input Amplitude (dBFS)0–10–20–30–40–50–60–70–80–90–100–110–120–130O u t p u t A m p l i t u d e (d B F S )LINEARITY with f IN = 200Hz(96kHz:48kHz)–130–120–110–100–90–80–70–60–500–40–30–20–10Input Amplitude (dBFS)0–10–20–30–40–50–60–70–80–90–100–110–120–130O u t p u t A m p l i t u d e (d B F S )LINEARITY with f IN = 200Hz(44.1kHz:192kHz)–130–120–110–100–90–80–70–60–500–40–30–20–10Input Amplitude (dBFS)SRC4190SBFS023A14/doc/PICAL CHARACTERISTICS (Cont.)At T A = +25°C, V DD = +3.3V, and V IO = +3.3V, unless otherwise noted.0–10–20–30–40–50–60–70–80–90–100–110–120–130O u t p u t A m p l i t u d e (d B F S )LINEARITY with f IN = 200Hz(192kHz:44.1kHz)–130–120–110–100–90–80–70–60–500–40–30–20–10Input Amplitude (dBFS)

0–10–20–30–40–50–60–70–80–90–100–110–120–130d B F SFREQUENCY RESPONSE with 0dBFS INPUT10k 20k 30k 40k 60k50k Frequency (Hz)0–0.01–0.02–0.03–0.04–0.05–0.06–0.07–0.08–0.09–0.10–0.11–0.12–0.13–0.14–0.15(d B F S )PASS BAND RIPPLE(48k:48k)5k10k15k22k20k Input Frequency (Hz)0–0.01–0.02–0.03–0.04–0.05–0.06–0.07–0.08–0.09–0.10–0.11–0.12–0.13–0.14–0.15(d B F S )PASS BAND RIPPLE(192k:48k)5k10k 15k 22k20k Input Frequency (Hz)PRODUCT OVERVIEWThe SRC4190 is an asynchronous sample rate converter (ASRC) designed for professional audio applications. Opera-tion atinput and output sampling frequencies up to 212kHz is supported, with an input/output sampling ratio range of 16:1 to 1:ent dynamic range and Total Harmonic Distortion + Noise (THD+N) are achieved by employing high performance andlinear phase digital filtering. Digital filtering options allow for lower group delay audio input and output ports support standard audio data formats, as well as a TDM interface mode. Word lengths of 24-,20-, 18-, and 16-bits are supported. Both ports may operate in Slave mode, deriving their word and bit clocks from externalinput and output devices. Alternatively, one port may operate in Master mode while the other remains in Slave mode. InMaster mode, the LRCK and BCK clocks are derived from the reference clock input, RCKI. The flexible configuration of theinput and output ports allows connection to a wide variety of audio data converters, interface devices, digital signalprocessors, and programmable logic.A bypass mode is included, which allows audio data to be passed directly from the input port to the output port, bypass-ingthe ASRC function. The bypass option is useful for passing through encoded or compressed audio data, or non-audio controlor status data.A soft mute function is available providing artifact-free opera-tion while muting the audio output signal. The mute attenu-ationis typically –128dB.

FUNCTIONAL BLOCK DIAGRAMFigure 1 shows a functional block diagram of the SRC4190. Audio data is received at the input port, clocked by either theaudio data source in Slave mode or by the SRC4190 in Master mode. The output port data is clocked by either the audiodata source in Slave mode, or by the SRC4190 in Master mode. The input data is passed through interpolation filters whichup-sample the data, which is then passed on to the re-sampler. The rate estimator compares the input and output samplingfrequencies by comparing LRCKI, LRCKO, and a reference clock. The results include an offset for the FIFO pointer and thecoefficients needed for re-sampling output of the re-sampler is then passed on to the decimation filter. The decimation filter performs down-sam-pling andanti-alias filtering 1. SRC4190 Functional Block 4190 SBFS023A15 /doc/C4190SBFS023A16/doc/FERENCE CLOCKThe SRC4190 requires a reference clock for operation. The reference clock is applied at the RCKI input, pin 2. Figure2illustrates the reference clock connections and requirements for the SRC4190. The reference clock may operate at 128f S,256f S , or 512f S , where f S is the input or output sampling frequency. The maximum external reference clock inputfrequency is 50 PORT MODESThe SRC4190 supports seven serial port modes, which are shown in Table 1. The audio port mode is selected using theMODE0 (pin 26), MODE1 (pin 27), and MODE2 (pin 28) Slave mode, the port LRCK and BCK clocks are config-ured as inputs, and receive their clocks from an external audiodevice. In Master mode, the LRCK and BCK clocks are configured as outputs, being derived from the reference FIGURE Pulse Width 4. Input Data 5. Input Port left/right word clock, LRCKI (pin 6), may be configured as an input or output pin. In Slave mode, LRCKI is an input pin,while in Master mode LRCKI is an output pin. In either case, the clock rate is equal to f S, the input sampling frequency. TheLRCKI duty cycle is fixed to 50% for Master mode 2 illustrates data format selection for the input port. The IFMT0 (pin 10), IFMT1 (pin 11), and IFMT2 (pin 12) inputs areutilized to set the input port data 2IFMT1IFMT0INPUT PORT DATA FORMAT00024-Bit Left Justified00124-Bit I2S010Unused011Unused

10016-Bit Right Justified10118-Bit Right Justified11020-Bit Right Justified11124-Bit Right JustifiedTABLE 2. Input Port Data Format 4190 SBFS023A17 /doc/C4190SBFS023A18/doc/TPUT PORT OPERATIONThe audio output port is a four-wire synchronous serial interface that may operate in either Slave or Master UT output (pin 23) is the serial audio data data is output at this pin in one of four data formats:Philips I 2S,Left Justified, Right Justified, or TDM. The audio data word length may be 16-, 18-, 20-, or 24-bits. For all word lengths, thedata is triangular PDF dithered from the internal 28-bit data path. The data formats (with the exception of TDM mode) areshown in Figure 6, while critical timing parameters are shown in Figure 7 and listed in the Electrical Characteristics TDM format and timing are shown in Figures 11 and 12, respectively, while examples of stan-dard TDM configurationsare shown in Figures 13 and bit clock is either input or output at BCKO (pin 25). In Slave mode, BCKO is configuredas an input pin, and may operate at rates from 32f S to 128f S , with a minimum of one clock cycle for each data bit. Theexception is the TDM mode, where the BCKO must operate at N x 64f S , where N is equal to the number of SRC4190devices included on the TDM interface. In Master mode, BCKO operates at a fixed rate of 64f S for all data formats exceptTDM, where BCKO operates at the reference clock (RCKI) frequency. Additional information regarding TDM mode operationis included in the Applications Information section of this data left/right word clock, LRCKO (pin 24), may be configured as an input or output pin. In Slave mode, LRCKO is an inputpin, while in Master mode it is an output pin. In either case,the clock rate is equal to f S , the output sampling ck duty cycle is fixed to 50% for I 2S, Left Justified, and Right Justified formats in Master mode. The LRCKO pulse width isfixed to 32 BCKO cycles for the TDM format in Master 6. Output Data 7. Output Port 3 illustrates data format selection for the output port. The OFMT0 (pin 19), OFMT1 (pin 18), OWL0 (pin 17), and OWL1(pin 16) inputs are utilized to set the output port data format and word 1OFMT0OUTPUT PORT DATA FORMAT00Left Justified01I2S10TDM11Right JustifiedOWL1OWL0OUTPUT PORT DATA WORD LENGTH0024 Bits

0120 Bits1018 Bits1116 BitsTABLE 3. Output Port Data Format MODEThe SRC4190 includes a bypass function, which routes the input port data directly to the output port, bypassing the ASRCfunction. Bypass mode may be invoked by forcing the BYPAS input (pin 9) high. For normal ASRC operation, the BYPAS pinshould be set to dithering is applied to the output data in bypass mode; digital attenuation and mute functions are also unavailable in MUTE FUNCTIONThe soft mute function of the SRC4190 may be invoked by forcing the MUTE input (pin 14) high. The Soft mute functionslowly attenuates the output signal level down to all zeroes plus ±4LSB of dither. This provides an artifact-free muting of theaudio output OUTPUTThe SRC4190 includes an active low ready output named RDY (pin 15). This is an output from the rate estimator block,which indicates that the input-to-output sampling frequency ratio has been determined. The ready signal can be used as aflag or indicator output. The ready signal can also be connected to the active high MUTE input (pin 14) to provide an auto-mute function, so that the output port is muted when the rate estimator is in ATIONS INFORMATIONThis section of the data sheet provides practical applications information for hardware and systems engineers who will bedesigning the SRC4190 into their end ENDED CIRCUIT CONFIGURATIONThe typical connection diagram for the SRC4190 is shown in Figure 8. Recommended values for power supply bypasscapacitors are included. These capacitors should be placed as close to the IC package as 8. Typical Connection Diagram for the 4190 SBFS023A19 /doc/